Have you installed the missing libraries for 64bit as Medusa normally only supports 32bit?
Are you using the command sh /home../medusa4_5_2_1_linux_personal.sh ?
What are the rights of medusa4_5_2_1_linux_personal-sh?

I tried change differetn rights of this file and tried to run as root and have one error.
Running with command sh brings same result. What are adittional missing libraries for 64bit?
Maybe it's cause by somes rights of csh or tcsh? Can I check md5sum?

script uncompresses stuff into dir medusa4_pers. but tryes run ./install.csh -- from current dir then.
We can't change script due to integrity check fails. So, we have plan B - uncompress and keep, do not run now.